Introduction to Databases for Back-End Development

Meta’s introduction to the data layer that sits behind every back-end. Worked through relational database fundamentals — tables, schemas, keys, and relationships — and SQL for querying and modifying data, plus how a back-end actually talks to the database it depends on.

• Why back-end systems need databases
• Relational vs non-relational data models
• Tables, columns, rows, and schemas
• Primary keys, foreign keys, and relationships
• SQL fundamentals: SELECT, INSERT, UPDATE, DELETE
• Filtering, sorting, and grouping query results
• Joining data across multiple tables
• Database design and normalisation basics